1664469813 has 8 divisors (see below), whose sum is σ = 2349839808. Its totient is φ = 1044373184.

The previous prime is 1664469809. The next prime is 1664469841. The reversal of 1664469813 is 3189644661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1664469813 - 2² = 1664469809 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664469113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16318281 + ... + 16318382.

It is an arithmetic number, because the mean of its divisors is an integer number (293729976).

Almost surely, 2^1664469813 is an apocalyptic number.

It is an amenable number.

1664469813 is a deficient number, since it is larger than the sum of its proper divisors (685369995).

1664469813 is a wasteful number, since it uses less digits than its factorization.

1664469813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32636683.

The product of its digits is 746496, while the sum is 48.

The square root of 1664469813 is about 40797.9143216905. The cubic root of 1664469813 is about 1185.1099408403.

The spelling of 1664469813 in words is "one billion, six hundred sixty-four million, four hundred sixty-nine thousand, eight hundred thirteen".